Is CVE-2026-55494 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-55494?

CVE-2026-55494 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-55494

Description

Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.30.4, Tugtainer Agent allows unauthenticated access to Docker management APIs when AGENT_SECRET is not configured. The Agent uses request signatures to protect its API routes. However, in agent/auth.py, the signature verification function returns successfully if Config.AGENT_SECRET is empty. This causes protected Agent APIs to become accessible without authentication. This issue has been patched in version 1.30.4.